Experimental Study on Extracting Clean Energy from Vortex Induced Vibration

Mohtat, Pouya | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49206 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour, Majid
  7. Abstract:
  8. Two experimental models were designed and tested to extract energy from vortex induced vibrations of a elastically mounted one degree of freedom rigid cylinder in the Reynolds range of 120000 < Re <220000. In the first model the amplitude and frequency of the movement was measured then a second model was designed to be tested in the Emam Hossein marine laboratory. The model was designed in a way that many of its properties like mass ratio, spring constant and damping coefficient were able to be altered. In this study the vortex induced vibration of an elastically mounted cylinder was scrutinized in high Reynolds and very low mass ratios for the first time and an amplitude ratio of 2.49 were measured without the damping from gearbox and motor. Several systems were examined for the power take off system, then a system consisting of a pair of spools and cable with an electric generator was deemed to be the best choice for the experimental model. The generated power in different velocities and for different resistances was investigated. The maximum generated power was 14.9 watts with a resistance of 70 ohms and an efficiency of 9.8 percent. The amplitude and frequency of the vibration were examined using a thorough Fourier analysis. In the second part of the study ANSYS CFX was employed to simulate the VIV motion. The minimum size for computational domain and appropriate number of cells to simulate VIV accurately is discussed. The numerical results were compared to the experimental data and the phase angle between lift force and amplitude and different modes of vortex shedding are studied
  9. Keywords:
  10. Vortex Pattern ; Numerical Computation Method ; Vortex-Induced Vibration (VIV) ; ANSYS Software ; Vortex Energy Converter ; Vortex Separation Pattern

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